Pipe coupling



FIG. 1 is an isometric view of our design for a pipe coupling;

FIG. 2 is a front view of the design of the pipe coupling shown in FIG. 1, the rear view being a mirror image thereof;

FIG. 3 is a left side view of the design of the pipe coupling shown in FIG. 1, the right side view being a mirror image thereof;

FIG. 4 is a top view of the design of the pipe coupling shown in FIG. 1; and,

FIG. 5 is a bottom view of the design of the pipe coupling shown in FIG. 1.

The broken lines depict portions of the pipe coupling that form no part of the claimed design. 

CLAIM We claim the ornamental design for a pipe coupling, as shown and described. 